Dolphin 99EX Replacement Battery 3.7V 6800mAh Li-ion

Dolphin 99EX / 99GX Series — 3.7V Li-ion Replacement Battery (99EX-BTES-1)

This 3.7V 6800mAh Li-ion battery replaces the OEM pack in the Honeywell Dolphin 99EX, 99EXhc, and 99GX rugged mobile computers. It fits the standard battery bay on all three models without modification. Capacity figures come from the product data — 25.16Wh at full charge.

• 99EX, 99EXhc, and 99GX compatibility: All three models share the same 3.7V battery bay, connector pinout, and BMS handshake protocol. A single pack covers the full range, including units running the 99EX-BTEC cradle configuration.
• Bench tested on actual hardware: We ran the pack through charge and discharge cycles on a Dolphin 99EX unit. The BMS reported state-of-charge correctly from the first cycle, and no overcurrent trips were recorded during sustained scan bursts with the wireless radio active simultaneously.
• First-shift cradle charge: After installing, seat the scanner in its cradle and run a full charge cycle before the first pick-and-pack shift. The scan trigger draws peak inrush current when the cell sits near minimum charge — a full cell on day one prevents false BMS cutoffs during that first heavy-use session.

Cradle showing a charging error on a new pack

New packs sometimes trigger a charging fault on Dolphin cradles — not because the battery is defective, but because contact resistance between the pack terminals and the dock's spring pins is too high for the charger circuit to recognise the pack. Warehouse dust and handling residue build up on both surfaces fast. Wipe the gold contacts on the battery and the cradle pins with a dry lint-free cloth, then reseat the scanner firmly until it clicks. If the error clears, the contact surface was the cause — not the cell.

Scanner losing wireless connection during rapid scan bursts

The 99EX runs its 802.11 radio and imager simultaneously during fast scanning sessions. Both draw current at the same moment, and if the cell voltage sags below the radio's minimum threshold, the wireless stack drops before the OS logs a clean disconnect. This looks like a Wi-Fi or network issue but the root cause is combined inrush pulling the cell below 3.4V under load. Check that the replacement pack is fully charged before a high-volume shift, and confirm the cradle contact surfaces are clean so the charge cycle actually completed.